std::is_literal_type

Defined in header `<type_traits>`
template< class T > struct is_literal_type;		(since C++11) (deprecated in C++17) (removed in C++20)

If T satisfies all requirements of LiteralType, provides the member constant value equal true. For any other type, value is false.

The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void.

Template parameters

T

-

a type to check

Helper variable template

template< class T > inline constexpr bool is_literal_type_v = is_literal_type<T>::value;		(since C++17) (deprecated) (removed in C++20)

Inherited from std::integral_constant

Member constants

value

[static]

true if T is a literal type , false otherwise
(public static member constant)

Member functions

operator bool	converts the object to bool, returns `value` (public member function)
operator() (C++14)	returns `value` (public member function)

Member types

Type	Definition
`value_type`	`bool`
`type`	std::integral_constant<bool, value>

Notes

Only literal types may be used as parameters to or returned from constexpr functions. Only literal classes may have constexpr member functions.

Example

Run this code

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    virtual ~B();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_literal_type<A>::value << '\n';
    std::cout << std::is_literal_type<B>::value << '\n';
}

Output:

true
false

Language
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